text: //
  // Copyright 2005-2007 Adobe Systems Incorporated
  // Copyright 2018 Mateusz Loskot <mateusz at loskot dot net>
  //
  // Distributed under the Boost Software License, Version 1.0
  // See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt
  //
  #include <boost/gil/channel_algorithm.hpp>
  
  #define BOOST_TEST_MODULE test_algorithm_channel_relation
  #include "unit_test.hpp"
  #include "test_fixture.hpp"
  
  namespace gil = boost::gil;
  namespace fixture = boost::gil::test::fixture;
  
  template <typename ChannelFixtureBase>
  void test_channel_relation()
  {
      using fixture_t = fixture::channel<ChannelFixtureBase>;
      using channel_value_t = typename fixture_t::channel_value_t;
      channel_value_t const one = 1;
  
      fixture_t f;
      BOOST_TEST(f.min_v_ <= f.max_v_);
      BOOST_TEST(f.max_v_ >= f.min_v_);
      BOOST_TEST(f.min_v_ < f.max_v_);
      BOOST_TEST(f.max_v_ > f.min_v_);
      BOOST_TEST(f.max_v_ != f.min_v_);
      BOOST_TEST(f.min_v_ == f.min_v_);
      BOOST_TEST(f.min_v_ != one); // comparable to integral
  }
  
  BOOST_AUTO_TEST_CASE_TEMPLATE(channel_value, Channel, fixture::channel_byte_types)
  {
      using fixture_t = fixture::channel_value<Channel>;
      test_channel_relation<fixture_t>();
  }
  
  BOOST_AUTO_TEST_CASE_TEMPLATE(channel_reference, Channel, fixture::channel_byte_types)
  {
      using fixture_t = fixture::channel_reference<Channel&>;
      test_channel_relation<fixture_t>();
  }
  
  BOOST_AUTO_TEST_CASE_TEMPLATE(channel_reference_const, Channel, fixture::channel_byte_types)
  {
      using fixture_t = fixture::channel_reference<Channel const&>;
      test_channel_relation<fixture_t>();
  }
  
  BOOST_AUTO_TEST_CASE_TEMPLATE(packed_channel_reference, BitField, fixture::channel_bitfield_types)
  {
      using channels565_t = fixture::packed_channels565<BitField>;
      test_channel_relation<typename channels565_t::fixture_0_5_t>();
      test_channel_relation<typename channels565_t::fixture_5_6_t >();
      test_channel_relation<typename channels565_t::fixture_11_5_t>();
  }
  
  BOOST_AUTO_TEST_CASE_TEMPLATE(packed_dynamic_channel_reference, BitField, fixture::channel_bitfield_types)
  {
      using channels565_t = fixture::packed_dynamic_channels565<BitField>;
      test_channel_relation<typename channels565_t::fixture_5_t>();
      test_channel_relation<typename channels565_t::fixture_6_t>();
  }
  